Contraception method

ABSTRACT

A method of achieving contraception in a woman which comprises administering orally to said woman an estroprogestative composition comprising nomegestrol acetate and an estrogen is provided.

This application is a continuation-in-part of U.S. Ser. No. 10/753,073, filed Jan. 8, 2004, now abandoned, which was a continuation-in-part of (i) U.S. Ser. No. 09/284,147, filed Mar. 17, 1999, now U.S. Pat. No. 6,831,073, issued Dec. 14, 2004, §371 national stage of PCT International Application No. PCT/FR97/01792, filed Oct. 8, 1997, claiming priority of French Patent Application No. 96/12239, filed Oct. 8, 1996; and (ii) U.S. Ser. No. 09/423,108, filed Oct. 29, 1999, now U.S. Pat. No. 6,906,049, issued Jun. 14, 2005, claiming priority of PCT International Application No. PCT/FR99/02587, filed Oct. 25, 1999.

BRIEF SUMMARY OF THE INVENTION

The present invention relates to the field of therapeutic chemistry and more particularly to the field of hormonal pharmaceutical techniques.

DETAILED DESCRIPTION OF THE INVENTION

A more precise subject of the invention is new pharmaceutical compositions formed by an estroprogestative combination with a view to the correction of estrogenic deficiencies in natural or artificial menopauses or in order to stop ovulation of women during their period of ovarian activity.

In particular a subject of the invention is an estroprogestative combination, characterized in that it is constituted by unit doses containing the combination of a progestative and an estrogen, the two components being present simultaneously in each medicinal dose.

This combination is intended to be administered by oral route.

As is known, the life expectancy of women has passed in less than a century from 50 to 80 years, whilst the average age for the onset of the menopause has remained unchanged. Therefore, women spend a third of their life in a state of estrogenic deficiency which is the origin of the increase in risk of osteoporosis and cardiovascular illnesses.

Sequential replacement treatment for the menopause cures the climateric symptomology a id prevents osteoporosis and the onset of illnesses. It creates artificial cycles which are followed by a withdrawal bleeding. This therapeutic schema quite particularly suits women for whom the menopause is recent but it is not always well accepted in the long term, which in part explains the poorer observance of treatment (DRAPIER FAURE E.; Gynecologie. 1992, 43: 271-280).

In order to overcome this drawback, combined combinations have been perfected where the two components are taken simultaneously, the progestative having the effect of permanently opposing the proliferative action of the estrogen on the endometrium, by creating an atrophy of the endometrium and as a consequence, the absence of withdrawal bleeding (HARGROVE J. T., MAXSON W. S., WENTZ A. C., BURNETT L. S., Obstet Gynecol, 1989, 73: 606-612).

This “no periods” schema more particularly suits women for whom the menopause is already well in the past. It can be prescribed in courses of sequential combinations in order to improve the long-term observance of replacement hormone treatment for the menopause.

The dose of progestative to be used in a combined replacement treatment is in general deduced from that which is usually prescribed in sequential schemata. In the latter the dose chosen is that which gives over the long term less than 1% endometrial hyperplasia when the progestative is administered discontinuously, more than 10 days per cycle, in post-menopausal women under replacement estrogenotherapy (WHITEHEAD et al., J. reprod. Med, 1982, 27: 539-548, PATERSON et al, Br Med J, Mar. 22, 1980, 822-824).

In the combined treatment, these same progestatives were used at half the dose judged to be effective during a sequential treatment: this is the example of the micronized progesterone, didrogesterone (FOX H., BAAK J., VAN DE WEDER P., AL-AZZAWI E., PATERSON M., JOHNSON A., MICHELL G., BARLOW D., FRANCIS R., 7th International Congress on the Menopause, Stockholm, Jun. 20-24, 1993, abstr 119) and medroxyprogesterone acetate (BOCANERA R, BEN J., COFONE M., GUINLE I., MAILAND D., SOSA M., POUDES G., ROBERTI A., BISO T., EZPELETA D., PUCHE R., TOZZINI R., 7th International Congress on the Menopause, Stockholm, Jun. 20-24, 1993, abstr 40) which were used at doses of 100, 10 and 5 mg/day respectively, with encouraging results on the clinical and endometrial level.

Among the progestatives, nomegestrol acetate appeared to be one of the most effective. Nomegestrol acetate is a non-androgenic progestative derived from 19-nor progesterone, its use in sequential administration during the menopause at the dose of 5 mg/day, 12 days per cycle, in combination with different types of estrogens, allows endometrial hyperplasia to be prevented as shown by a multicentre study on 150 women for one year (THOMAS J. L., BERNARD A. M., DENIS C., 7th International Congress on the Menopause, Stockholm, Jun. 20-24, 1993, abstr 372).

The absence of hyperplasia was confirmed in a study where the nomegestrol acetate was administered at the same dose, 14 days per cycle, in women treated with percutaneous estradiol (BERNARD A. M. et al. Comparative evaluation of two percutaneous estradiol gels in combination with nomegestrol acetate in hormone replacement therapy. XIV World Congress of Gynecology and Obstetrics, FIGO, Montreal, Sep. 24-30, 1994).

The combined treatment is more often used in a continuous fashion, i.e. without interruption. However some people are in favour of using it in an intermittent fashion, for example 25 days per month (BLRKAUSER M. ET AL; Substitution hormonale: une indication bien posée et des schémas de traitement individuels sont déterminants pour le succès du traitement, Méd. et Hyg., 1995, 53: 1770-1773). The aim of the therapeutic interruption is to remove the inhibition exercised by the progestative on the synthesis of the estradiol and progesterone receptors and in this way to avoid the lowering of receptivity of the hormono-dependant tissues.

The progesterone used according to the present invention is nomegestrol acetate which is active by oral route.

The estrogen used is free or esterified estradiol, or conjugated equine estrogens which are presented according to a formulation which is active by oral route and in particular estradiol valerate.

Nomegestrol acetate and free or esterified estradiol or conjugated equine estrogens are administered in one of the forms which permit administration by oral route: gelatine capsules, capsules, pills, sachets of powder, tablets, coated tablets, sugar-coated tablets etc.

The present invention is characterized in that it is constituted by a new estroprogestative combination, which is active by oral route and administered in a combined manner. A subject of the present invention is also its use in the correction of estrogenic deficiencies, in the prevention of osteoporosis and cardiovascular illnesses in post-menopausal women, or in stopping ovulation in women during their period of ovarian activity.

The compositions according to the invention based on nomegestrol and free or esterified or equine conjugated estrogens are administered in a continuous fashion or intermittent fashion from 21 to 25 days per month.

According to a particular implementation of the invention the compositions contain a quantity of nomegestrol acetate ranging from 1.5 to 3.75 mg and a quantity of free or esterified estradiol or conjugated equine estrogens ranging from 0.5 to 3 mg. Preferably, the optimal formulations contain 2.5 mg of nomegestrol acetate combined with: either 1.5 mg of free estradiol or 2 mg of estradiol ester or 0.625 mg of conjugated equine estrogens, per daily dose.

This combined administration method can have several therapeutic indications. In post-menopausal women, the estroprogestative combination is intended to compensate for the functional disorders brought about by hypoestrogenism of the menopause, while maintaining an atrophy of the endometrium and avoiding in a majority of them the appearance of withdrawal bleeding.

In women during the period of ovarian activity, young or in the years preceding the menopause, the cyclic administration of the hormonal combination is capable of stopping ovulation and of exercising a contraceptive effect insofar as it has been proved that nomegestrol is capable of stopping the ovulation peak of LH and FSH, starting from 1.25 mg/day (BAZIN B. et al, Effect of nomegestrol acetate, a new 19-norprogesterone derivative on pituitary ovarian function in women. Br. 1. Obstet. Gynaecol., 1987, 94: 1199-1204). When the hormonal combination is given for a contraceptive purpose, the aim of nomegestrol acetate is to stop ovulation and for the estrogenic compound to compensate for hypoestrogenia and ensure a better control of the cycle.

A subject of the present invention is also a process for obtaining new pharmaceutical compositions.

The obtaining process according to the invention consists of mixing the active ingredients: nomegestrol acetate and free or esterified estradiol or conjugated equine estrogens with one or more pharmaceutically acceptable, non-toxic, inert excipients.

Among the excipients which can be mentioned are binding and solubilizing agents, compression agents, disintegration agents and slip agents.

This mixture can be subjected to direct compression or to several stages of compression in order to form tablets which, if desired, can have their surface protected by a film, by lacquering or coating. The production of tablets by direct compression allows a maximum reduction in the proportion of diluting agents, binding agents, disintegration agents and slip agents.

The production of gelatine capsules can be carried out by mixing the active ingredients with an inert diluent and a slip agent.

The tablets contain, in particular, mass diluting agents such as lactose, sorbitol for direct compression, marketed under the name NEOSORB 60, Palatinite which is a registered trademark for designating an equimolar mixture of the isomer of -D-glucopyranosido 1,6-mannitol and -D-glucopyranosido 1,6-glucitol crystallized with two molecules of water, mannitol, sorbitol or the mixture lactose/PVP sold under the name Ludipress.

The compression binding agents are in general microcrystalline celluloses such as those sold under the name AVICEL PH 101 or AVICEL PH 102.

The polyvinylpyrrolidone plays an important role and facilitates the agglomeration of the powders and the compressibility of the mass. To this end polyvinylpyrrolidones are used with a molecular weight comprised between 10000 and 30000 such as Povidone, Kollidon of a grade comprised between 12 and 30.

The mixture also contains slip or anti-electrostatic agents so that the powder does not agglomerate in the feed hoppers. In this respect, colloidal silicas can be mentioned which are sold under the name AEROSIL 100 or AEROSIL 200.

The mixture also contains disintegration agents which allow disintegration or crumbling which conforms to pharmaceutical standards. There can be mentioned as useful disintegration agents, polymers of cross-linked vinylpyrrolidones such as those sold under the names Polyplasdone or Polyclar AT, carboxymethylamidons such as those sold under the names Amigel or Explotab, cross-linked carboxymethylcelluloses or croscarmelloses such as the compound sold under the name AC-DI-SOL>.

In addition, the preparation contains lubrication agents which facilitate the compression and ejection of the tablet from the tablet compressing machine. There can be mentioned as lubrication agents, glycerol palmitostearate sold under the name Precirol, magnesium stearate, stearic acid or talc.

After compression the tablets can be coated in order to ensure their storage or to facilitate their deglutination.

The coating agents are either of cellulose origin such as cellulose phthalate (Sepifilm, Pharmacoat), or of polyvinyl origin of Sepifilm ECL type, or of saccharose origin such as the sugar for sugar-coating of Sepisperse DR, AS, AP OR K (coloured) type.

The tablets, whether coated or not, can in addition, be surface or bulk coloured, by plant or synthetic colouring agents (for example chinolin yellow lacquer or E 104).

The proportions of the different constituents vary according to the type of tablet to be produced.

The content of active ingredients can vary from 1.5 to 3.75 mg for nomegestrol acetate and from 0.5 to 3 mg for free or esterified estradiol or for conjugated equine estrogens. The dilution agents vary from 20 to 75% of the total mass, the slip agents from 0.1 to 2% of the total mass, the compression binding agents vary from 2 to 20%, the polyvinylpyrrolidone from 0.5 to 15%, the disintegration agents vary from 2 to 5.5% for the cross-linked polyvinylpyrrolidone or the carboxymethylamidon, from 2.0 to 3.0% for the croscarmellose.

The quantities of lubricating agents vary as function of the type of agents from 0.1 to 3.0%.

The compositions according to the invention are intended to be administered once per day. However, depending on the therapeutic requirements, administration can be split up (twice per day) or on the other hand, repeated (two tablets per day). The following examples illustrate the invention. They in no way limit it.

Example I Tablets with 4 mg of Active Ingredient

Active ingredients: estradiol 1.5 mg nomegestrol acetate 2.5 mg Microcrystalline cellulose 22.4 mg (marketed under the name AVICEL PH 102) Lactose 60 mg Polyvinylpyrrolidone 8.4 mg Colloidal silica 1.2 mg Glycerol palmitostearate 3.6 mg Colouring agent E.104 0.4 mg for a tablet completed at an average weight of 100 mg.

Example II Study of the Clinical Tolerance During Two Continuous Combined Schemata of Hormone Replacement Therapy for the Menopause

The pilot study is carried out over 24 weeks on two parallel groups subjected to treatments A and C:

Treatment A

-   -   Nomegestrol acetate 2.5 mg/day every day+percutaneous         17β-estradiol 1.5 mg/day every day.     -   The nomegestrol acetate is administered in the form of tablets         and the percutaneous 17β-estradiol in the form of a gel.         Treatment C     -   Nomegestrol acetate 2.5 mg/day every day+estradiol valerate 2         mg/day every day.     -   The estradiol valerate is administered in the form of tablets.

The pilot study is intended to evaluate the endometrial clinical tolerance during the use of the two hormone replacement therapy schemata for the menopause so called “without periods” combining in a continuous combined fashion treatment A or C. The endometrial clinical tolerance is evaluated from the presence or not of occurrences of vagina bleeding, their intensity, their frequency, from data acquired from endovaginal echographical examination etc.

Also, another aim of this study is to assess the general clinical tolerance (weight, blood pressure, mammary symptoms), biological tolerance (Formule Numeration Sanguine (blood count), glycemia, cholesterol . . . ), as well as the observance of treatment.

The selection of subjects is carried out as a function of “inclusion” criteria. These criteria are to do:

-   -   with the menopause:         women over 50 years old are included who have had a natural         menopause expressed clinically by an amenorrhea greater than 12         months and less than 10 years, the women having had a natural         menopause confirmed biologically by quantitative analysis of FSH         (Follicle stimulating hormone) and estradiol (i.e. plasmatic         FSH≧20 IU/I, plasmatic E₂≦0.11 nmol/l).     -   with women:         women who have not had hysterectomies are included, whose         Quetelet's index (weight in kg/(height in m)²) is ≦27, having         had regular cycles before the menopause, having never received         hormone replacement therapy for the menopause or having had a         clinically well tolerated hormone replacement therapy (absence         of abnormal bleeding), interrupted for more than 6 weeks,         presenting an endometrial thickness measured by endovaginal         echography ≦5 mm, accepting the idea of hormone replacement         therapy for the menopause, who would like a hormone therapy         without periods, justifying an estroprogestative hormone therapy         for at least 6 months, cooperative: accepting to conform to the         requirements of the study, whose psychic and intellectual         profile would allow one to suppose a good observance of the         treatment, having a mammograph dating from less than a year from         the date of inclusion.

At the start of treatment the patients undergo an inclusion consultation (C₁) the purpose of which is to verify that the inclusion criteria have been respected, that the endovaginal echograph is normal and to obtain the written consent of the patient as regards participation.

The intermediate consultation (C₂) takes place between the 9th and 11th week of treatment, the purpose of which is to verify mammary and endometrial clinical tolerance is good as regards the treatment.

Lastly, a final consultation (C₃) takes place during the 24th week of treatment.

The patients who wish to continue the study can receive, for 24 additional weeks, the estroprogestative treatment received during the study according to the same therapeutic schema. The extension of the study thus allows a complete monitoring of the study over 48 weeks.

Analysis of the Study

Results I

The attached Tables I and II, reveal a difference in terms of the amenorrhea results (i.e. no bleeding from 0 to 24 weeks) and of mammary and/or endometrial tolerance as a function of the estrogen.

TABLE I Treatment A Nomegestrol acetate + percutaneous 17β-estradiol Elapse since Duration of Endometrial menopause Presence of HRT Start of treatment thickness ameno/month previously treatment weeks before/after mm COMMENTS 72 no 17 Oct. 1994 24 2/2 Amenorrhea 24 ext endometrial thickness after 48 weeks of treatment = 2 mm 82 no 04 Nov. 1994 24 3/3 amenorrhea extension 26 yes 09 Jan. 1995 24 3/3 amenorrhea well tolerated extension 108 no 16 Jan. 1995 24 1/4 amenorrhea extension 48 no 13 Feb. 1995 24 3/2 1 episode of bleeding at 42 days (a few drops) between the 1^(st) and 6^(th) weeks; breast tension and pain of minimal intensity from the 1st to the 22nd week (7 days/week) Extension not effected: did not pick up the treatment kit owing to holidays; following the same treatment outside protocol 24 no 10 Mar. 1995 24 2/5 Amenorrhea; breast tension and pain of slight intensity extension from the 6th to the 12th week (7 days/week) 55 yes 20 Mar. 1995 24 4/8 amenorrhea well tolerated extension 27 yes 08 May 1995 24 3/5 Amenorrhea well tolerated Extension not effected: did not pick up the treatment kit owing to holidays; same treatment outside protocol 90 yes 10 Apr. 1995 24 4/4 amenorrhea well tolerated extension 13 yes 03 Jul. 1995 24 1 pending amenorrhea well tolerated extension 99 yes 24 Apr. 1995 24 1/4 amenorrhea well tolerated extension 21 yes 26 Jun. 1995 24 4 pending amenorrhea well tolerated extension 96 ? 29 May 1995 24 2 pending amenorrhea extension 65 yes 10 May 1995 24 1/3 amenorrhea; 10 episodes (4 days/week) of breast pains well tolerated extension of minimal intensity 13 no 12 Jun. 1995 Stopped at 6 3 not measured continuous slight bleeding from the 5th week until treatment stopped 38 yes 10 Jul. 1995 24 2 pending amenorrhea well tolerated extension EXTENSION = 24 additional weeks of treatment HRT = hormone replacement therapy

Conclusion

Of the 16 patients treated:

-   -   1 left the study, i.e. 6%     -   15 finished the study after 24 weeks, i.e. 94%     -   13 extensions of treatment (24 additional weeks) 81%         The two extensions which did not take place when due to reasons         which were independent of the treatment, the patients continued         the same treatment outside the treatment protocol.

TABLE II Treatment C Nomegestrol acetate + estradiol valerate per os Elapse since Duration of Endometrial menopause Presence of HRT Start of Treatment Thickness ameno/month previously treatment weeks before/after mm COMMENTS 72 no 21 Nov. 1994 stopped at 8 4/* amenorrhea, breast tension and pain of slight intensity from the 2nd week to the 8th week; STOPPED owing to high abdominopelvic tension due to increased size of a sub-serous fibroma: echo before treatment = 37 mm; echo after 8 weeks of treatment = 75 mm 46 yes 28 Nov. 1994 24 3/6 1 episode of bleeding of 31 days between the 5^(th) and well tolerated extension the 9^(th) week (a few drops) 31 yes 28 Nov. 1994 stopped at 10 2 not measured amenorrhea, STOPPED for insomnia, nervousness and pain well tolerated in lower limbs 60 yes 30 Jan. 1995 24 4/2 amenorrhea, breast tension and pain of slight intensity well tolerated extension from 2^(nd) week of treatment until the 19^(th) week 121 yes 06 Feb. 1995 stopped at 9 3 not measured 1 episode of bleeding of 16 days of low intensity from well tolerated the 6th week; breast tension of minimal intensity from the 2nd week to the 8^(th) week; STOPPED owing to headaches, night sweats and a blood pressure of 17/10 36 yes 06 Feb. 1995 24 4* amenorrhea, 23 episodes of breast tension of high well tolerated intensity of 7 days/week; extension impossible as estrogen dose reduced due to breast tension 47 yes 27 Feb. 1995 24 2/2 amenorrhea; 6 episodes of breast tension and pain of well tolerated extension slight intensity (2 days/week) 62 no 13 Mar. 1995 24 1/4 amenorrhea extension 74 yes 20 Mar. 1995 24 4/6 amenorrhea well tolerated extension 110 yes 08 May 1995 stopped at 18 2 not measured amenorrhea until 12 weeks then 1 episode of bleeding well tolerated of 41 days until treatment stopped 16 yes 22 May 1995 24 1 pending amenorrhea well tolerated extension 60 yes 12 Jun. 1995 stopped at 16 2/3 4 episodes of bleeding of low intensity (6 days/week) well tolerated 5 episodes of breast pain of medium intensity (6 days/ week); STOPPED owing to mastitis and a breast abscess 11 no 19 Jun. 1995 24 2 pending 1 episode of bleeding 12 days (a few drops) extension 38 yes 03 Jul. 1995 stopped at 4 5 not measured 1 episode of bleeding of 11 days until treatment well tolerated stopped of low intensity *= not measured at the control echo

Conclusion

Of the 14 patients treated

-   -   6 left the study i.e. 43%     -   8 finished the study after 24 weeks, i.e. 57%     -   7 extensions of treatment (24 additional weeks), i.e. 50%         % of amenorrhea (i.e. no occurrence of bleeding for 24         weeks)=43%         Results II         A—Observance

While no significant difference exists between the two groups A and C, a lower number of days when treatment lapsed over all the 24 weeks of the study was observed with treatment A.

B—Endometrial Clinical Tolerance

The most significant absolute percentage of amenorrhea is found in group A, the difference being significant in phase II (13th to 24th week of treatment) As has been described in the literature, the percentage of amenorrhea increases with time; therefore, for group C, it is 35.3% during the first 12 weeks of treatment, and 46.1% during the last 12 weeks.

The attached tables III, IV and V illustrate the results obtained.

Amenorrhea

Analysis Regarding Treatment

TABLE III Phase I/weeks 1 to 12 TOTAL GROUP A GROUP C N % N % N % P Amenorrhea yes 19 37.2% 9 50% 6 35.3% no 32 62.7% 9 50% 11 64.7% 0.316 Spotting yes 32 62.7% 9 50% 11 64.7% no 19 37.2% 9 50% 6 35.3% 0.316 TOTAL GROUP A GROUP C avg ± week avg ± week avg ± week N (min:max) N (min:max) N (min:max) P Total duration of bleeding 51 9.1 ± 2.1 18 9.1 ± 4.5 17 8.9 ± 2.7 0.412 (days)  0:70  0:70  0:31 Average intensity 51 0.8 ± 0.1 18 0.7 ± 0.2 17 0.9 ± 0.2 0.446 0:2 0:2   0:2.5 Number of weeks of 51 2.1 ± 0.4 18 1.8 ± 0.7 17 2.1 ± 0.5 0.552 bleeding  0:10  0:10 0:7 Total number of episodes 51 1.2 ± 0.2 18   1 ± 0.3 17 1.2 ± 0.4 0.434 0:6 0:4 0:6 None of the patients suffered from metrorrhagias during phase I

TABLE IV Phase II/weeks 13 to 24 TOTAL GROUP A GROUP C N % N % N % P Amenorrhea yes 20 42.5% 12 66.7% 6 46.1% no 27 57.4% 6 33.3% 7 53.8% 0.006 Spotting yes 27 57.4% 6 33.3% 7 53.8% no 20 42.5% 12 66.7% 6 46.1% 0.006 TOTAL GROUP A GROUP C avg ± week avg ± week avg ± week N (min:max) N (min:max) N (min:max) P Total duration of bleeding 47 13.9 ± 3.1  18 6.2 ± 3.3 13 18.5 ± 7.7  0.013 (days)  0:75  0:42  0:75 Average intensity 47 0.9 ± 0.1 18 0.6 ± 0.2 13 1.0 ± 0.3 0.055 0:2   0:2.33 0:2 Number of weeks of 47 2.9 ± 0.6 18 1.3 ± 0.6 13 3.3 ± 1.2 0.007 bleeding  0:12 0:9  0:11 Total number of episodes 47 1.3 ± 0.3 18 0.6 ± 0.3 13 1.1 ± 0.5 0.002 0:7 0:6 0:7 None of the patients suffered from metrorrhagias during phase II

TABLE V Δ % TOTAL GROUP A GROUP C Between C1 avg ± week avg ± week avg ± week And C3 N (min:max) N (min:max) N (min:max) P A.L.A.T. 43 −23.1% ± 5.2% 17 −19.0% ± 3.8% 11  −31.2% ± 13.2% 0.936 −88.2%:85.7% −50%:7.1%  −88.2%:29.4% F.S.H. 45 −74.1% ± 4.9% 18 −72.2% ± 5.5% 12 −78.2% ± 9.6%  0.405 −98.4%:69.2% −98%:24.8% −98.4%:22.8% Estradiol (pg/ml) 40   432% ± 68.5% 15   567% ± 118.7% 10   609% ± 163.6% 0.036  −54%:1640%  −16%:1320%  −54.3%:1640% A.L.A.T. = Alanine Aminotransferase Transaminase F.S.H.—Follide Stimulating Hormone

The relative variation in estradiol level is quite important in the two groups (Δ%=567% in group A and 609% in group C), p=0.04

Table VI illustrates another study which was carried out. In this other study, it is interesting to note that with nomegestrol acetate, the percentage of patients with absolute amenorrhea (including all forms of estrogenotherapy) is greater from the 3rd month of treatment: 42.5% against 33.3%. In the treatment mentioned above, one must wait until the 12th month of treatment to obtain this percentage of 42% of patients with amenorrhea which was obtained here from 3 months, whilst the populations are comparable in terms of age, weight and length of time since the menopause. In addition, there exists in the previous study, an estrogen effect which is not found in this other study. On the other hand, this study reveals a dosage effect of progestative during the last 9 months of treatment (the lower the dose of progestative the better the cycle is controlled).

Finally, it is interesting to note that no correlation exists between the existence of an amenorrhea at 6 months and the endometrial thickness measured by endovaginal echography; this thickness varying by +1.6 mm on average over 6 months in the 2 treatment groups.

TABLE VI Characteristics of the patients TOTAL GROUP A GROUP C avg ± week avg ± week avg ± week N (min:max) N (min:max) N (min:max) P Age 54 54.9 ± 0.6 19 53.9 ± 0.8 17 54.9 ± 1.1 0.321 45:64 48:60 45:63 Age of 54 56.1 ± 5.0 19 48.5 ± 7.7 17 50.7 ± 7.7 0.309 amenorrhea (months)  7:134  12:108  11:121 Weight (kg) 54  60 ± 1.1 19 61.6 ± 1.2 17 60.8 ± 2.2 0.149 42:85 51:70 12:76 Height 54  1.61 ± 0.01 19  1.62 ± 0.01 17  1.61 ± 0.02 0.449 1.47:1.75 1.57:1.75 1.47:1.75 Quetelet's index 54 23.1 ± 0.4 19 23.3 ± 0.4 17 23.5 ± 0.7 0.3182 (kg/m²) 17.1:31.2 19.7:25.6 17.5:28.7 SBP (mmHg) 54 123.9 ± 1.5  19 127.9 ± 2.5  17 121.2 ± 2.5  0.136 100:140 110:140 110:140 DBP (mmHg) 54 74.6 ± 1.2 19 76.8 ± 2  17 73.5 ± 2.3 0.386 60:90 60:90 60:90 H.R.T. TOTAL GROUP A GROUP C Previous HRT's N % N % N % P yes 17 31.5% 9 47.4% 14 82.3% no 37 68.5% 10 52.6% 8 17.7% 0.046 HRT = Hormone Replacement Therapy SBP = Systolic Blood Pressure DBP = Diasystolic Blood Pressure 

1. A method of achieving contraception in a woman comprising the cyclic oral administration to said woman of an estroprogestative composition comprising 1.5 mg to 3.75 mg of nomegestrol acetate and 0.5 mg to 3 mg of a free or esterified estradiol or a conjugated equine estrogen, in an intermittent fashion from 21 to 25 days per month.
 2. The method according to claim 1, in which the estroprogestative composition comprises an estradiol ester.
 3. The method according to claim 2, in which the estradiol ester is estradiol valerate.
 4. The method according to claim 1, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate.
 5. The method according to claim 1, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate and 2 mg of estradiol ester.
 6. The method according to claim 1, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate and 0.625 mg of equine conjugated estrogens.
 7. A method of achieving contraception in a woman comprising administering orally to said woman in a continuous fashion an estroprogestative composition comprising 1.5 to 3.75 mg of nomegestrol acetate and 0.5 mg to 3 mg of a free or esterified estradiol or a conjugated equine estrogen.
 8. The method according to claim 7, in which the estroprogestative composition comprises an estradiol ester.
 9. Method according to claim 8, in which the estradiol ester is estradiol valerate.
 10. The method according to claim 7, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate.
 11. The method according to claim 7, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate and 1.5 mg of free estradiol.
 12. The method according to claim 7, in which the composition comprises 2.5 mg of nomegestrol acetate and 2 mg of estradiol ester.
 13. The method according to claim 7, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate and 0.625 mg of equine conjugated estrogens.
 14. A method of achieving contraception in a woman comprising the cyclic oral administration to said woman of an estroprogestative composition comprising 1.5 mg to 3.75 mg of nomegestrol acetate and 0.5 mg to 3 mg of a free or esterified estradiol in an intermittent fashion from 21 to 25 days per month.
 15. The method according to claim 14, in which the estroprogestative composition comprises 2.5 mg of nomegestrol acetate and 1.5 mg of free estradiol. 